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Патент USA US2406377

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Aug. 27, 1946.
R, 'B, ,MMEL '
2,406,377
ADJUSTABLE TIME LIMIT DEVI-CE
Filed July 20, 1943
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INVENTOR
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BY
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ATTORNEY
Aug- 27, 1946-
R. B. IMMIEL .
ADJUSTABLE TIME LIMIT_ DEVICE
7 2,406,377
Filed July 20, 1945
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BY
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ATTORNEY
Patented Aug. 27, I946
‘UNITED STATES PATENT OFFICE
Ralph E. Immel, Wilkinsburg, Pa., assignor to
Westinghouse Electric Corporation, East Pitts
burgh
, Pa., a corporation of
Pennsylvania
Application July 20, 1943, Serial No. 495,467
3 Claims. (Cl. 175-372)
2
My invention relates to direct-current ener
gized contactors, switches, relays and the like
tactor Whose manufacture and assembly can be
substantially completed regardless of the partic
body from its supporting frame or permanent cir_
cuit connections.
Another object in line with the foregoing is to
permit a ready adjustment or change of the time
limit by the user of the device, 1. e. outside the
factory or after the device has been installed in
its ultimate‘place of operation.
While the invention involves using a selective
plurality of short-circuited Winding elements, it
after .1
is also among its objects to render the time-limit
adjustment more accurate and de?nitely prede~
termined than heretofore obtainable.
netically reluctant shims or
netic circuit of the device and to adjust
turn spring of the relay armature'relative to the
ular, a de?nite dependence of the time limit on
the selected windings regardless of their speci?c
location along the
magnetic forces so as
them, is intended.
delays.
However, the time-limit devices of this type, as
25
Having these objects in mind, I propose accord
ing to this invention, to arrange the magnetizing
7st etofore available, offer a rather limited or no
coils of time-limit devices so that they surround
appreciable range of adjustability; that is, the
the appertaining magnet core with sumcient play
devices are usually manufactured for a given time
to form" a peripheral interstice, and to provide
limit and, once in the ?nished state, do not'permit
changing the limit to an appreciable extent, or 30
require for this purpose an extensive disassem
bly or reconstruction of the magnetic structure.
In one of the known time-limit relays, a plu
rality of copper discs are placed on the magnet
‘core of the relay, and the time limit is adjusted
of the inserted Winding
byselecting the number of discs thus employed. 35 elements relative tothe core
and determined only
The adjustment has to be made during the course
by the total cross section of the windings, or, if
of manufacture and cannot be changed Without
the elements are substantially alike, only on their
severing the permanently interconnected parts of
selected number.
the magnetic structure from one another and 40
According to another feature of my invention,
from their common base or support once the relay
the magnet core and armature of a time-limit
in been assembled in the factory; and it is also
device as relferredto above are attached to a
diilicult to obtain accurate and de?nitely prede
magnetic supporting structure so that the arma
termined time constants since the delay charac
ture is readily removable, While a selective plu
.teristic of this relay depends not only on the
rality of annular '
‘
number or total cross section of the copper discs,
but also on their location relative to the magnet
ture when the latter is removed.
core and armature.
In still another aspect, the invention provides
It is an object of my invention to provide an
an electromagnetic time-limit device with a fixed
elec romagnetic time-limit device Which aiTords
adjustment and change of the time limit with
considerably greater ease than afforded by the
known devices of this type. I
More speci?cally, in this aspect, the invention
aims at
providing a type of electromagnetic con- 55
52,406,397
3
interfere with the insertion or removal of
the
annular elements.
The invention is represented by the embodi
ments shown in the drawings, in which:
Figure 1 is a top view of a timing relay.
Fig. 2 is a part-sectional side elevation.
Fig. 3 is a front elevation of the same relay,
while
Fig. ashows a diagram of time delays in de
pendence upon the selected number of short—
circuited winding elements, and;
the illustrated position, the contact member H
is moved away from the stationary contacts [5
and Hi. When the armature is attracted by the
magnet core 2 against the force of spring in, the
contact member l4 moves against the stationary
contacts and establishes an electric connection
between terminals l1 and, I8 through contact
members l5, Ill and US.
As apparent from Figs. 1, 2 and 3, the armature
6 and all other parts assembled therewith can
be readily removed from the supporting structure
Figs. 5 through 7 are side elevations of three
other embodiments distinguished by different de
I and its appertaining parts by pulling the cross
bar ll out of engagement with the openings (3
of the abutment plate ‘I and then moving the
signs and arrangements of a magnetically re—
cross bar and the armature B away from the mag
15 net core 2. In the opposite manner, the assem
luctant shim element.
bly can be reinserted into the relay. When the
Referring to Figs. 1, 2 and 3, numeral I denotes
a magnetizable supporting structure consisting,
armature assembly is removed, the front surface
for instance, of an angular piece of iron.
of the core structure is readily accessible.
An
A magnetizing direct current coil is is mount
elongated cylindrical magnet core 2 is mounted
on the support I and carries at one end a shim 20 ed on a supporting structure I so as to surround
3 and a pole piece 4, both attached to the core
2 by means of a screw ‘5. The shim consists of
a material of high magnetic reluctance, for in
stance of a disc made of brass. The screw 5 may
also consist of brass or the like reluctant ma
terial. It should be noted that the diameter of
the shim 3 and of the pole piece 4 are equal to
the diameter of the core member 2 so that the
entire core assembly has a straight cylindrical
shape over the entire longitudinal extent of the
the core member 2 with sufficient play to form
a cylindric interstice between the core and coil.
Two bolts 20 and 2! serve for fastening the sup
porting structure I to a suitable base.
Referring more particularly to Fig. 2, it will be
seen that the just-mentioned interstice between
the magnet core and the magnetizing coil con
tains a plurality of annular elements 22. In the
illustrated embodiments, these elements consist
of slugs or rings of a material of relatively good
electric conductivity so that each of them forms
a short circuited current path around the magnet
A magnetic armature 6 has its upper edge
core assembly of elements 2, 3 and 4. The ele
placed against the support I and is held in posi
ments 22 may consist of copper rings although
tion by means of an abutment plate 1 which
other metals, such as iron, are also applicable.
is ?rmly attached to the structure I. The upper
The elements 22 are so dimensioned that they
edge of the armature 6 contacting the structure
have substantially the same size and can easily
I is cut in an acute angle in order to permit
be slipped on or off the magnet core when the
the armature 3 rotational movements about the
armature assembly is removed from the station
fulcrum formed by the armature edge. A brack
et member 9 is ?rmly secured to the armature 6, 40 ary relay structure.
The electric resistance of the short circuited
the lower end of this bracket, in the illustrated
current path, assuming that the same material
position, rests against a stationary abutment
is employed for all elements 22, depends on the
formed by a metal piece 8 which is mounted on
the supporting structure I. This abutment piece 45 total cross section of the elements placed between
the magnet core and the magnetizig coil. This
limits the motion of the armature 6 in the direc
total resistance and cross section can be adjusted
tion away from the magnet core 2 and as illus
by changing the number of elements 22. That
trated, may contain a screw for adjusting the
is, in order to increase the time constant of the
inactive position of the armature.
A bolt 26 has its lower end journalled to the
50 device the maximum number of elements 22, i. e.
bracket member 9 and carries a helical spring
six elements in the illustrated embodiment, are
l0 whose lower end rests against a nut 21 engag
to be inserted into the cylindrical interstice. For
ing the bolt 26, while the upper end of the spring
obtaining a lower time constant, the number of
assembly.
l0 abuts against the bracket member 9. The bolt
elements 22 is reduced, the minimum retardation
of relay action being obtained when all elements
formed by the abutment plate 1. The two ends 55 22 are removed from the interstice. The ele
26 carries a cross bar H which bridges a recess
of the cross bar are bent away at right angles
and form lugs l2 which engage corresponding
ments may have holes such as shown at 28 in
‘Fig. 2 or may be otherwise designed to facilitate
openings l3 of the abutment plate ‘I.
their removal.
Due to the above-described possibility of re
When the relay is in assembled condition as
represented by Figs. 1, 2 and 3, the spring I0 60 moving the armature assembly and by virtue of
is under compression and hence pulls the cross
bar ll against the abutment plate 1 thereby se
curing the lugs l2 in their engagement with the
openings l3 while holding the armature 6 and
the bracket 9 in the position shown in Fig. 2,
in which the bracket member 9 rests against the
abutment member 8. In this condition, the com
pressed spring [0 biases the armature 6 away
from the core 2.
A contact member [4 carrying two contact
pieces of silver is attached to the armature as
sembly and cooperates with two stationary con
tacts l5 and I6 which are ?rmly connected with
the supporting structure I and are in electric con
the fact that the space for receiving the short
circuited winding elements 22 is open towards
the armature and not obstructed by any part like
the shim 3 and the pole piece 4, the relay can
easily be adjusted to seven different time delays.
Since the time constant, though to a lesser de
gree, is also dependent on the adjustment force
of the spring ID, the relay permits also an ad
justment of its time constant to values interme
diate those obtained by the above-mentioned se
lection in the number of the winding elements
22. In other words, the adjusting nut 21 of spring
l0 affords a vernier adjustment of intermediate
time delay values.
tact with terminals l1 and I8, respectively. In 75
2,406,377
Due to the fact that all short circuiting wind
ing elements 22 lie within the range of the mag
net core surrounded by the magnetizing coil IS,
the location of the individual elements 22 along
the core 2 has no noticeable e?ect on the time
limit. Thus, even if only one element 22 is in
serted into the relay, the time limit remains the
6
"constructions are so designed that they do not
possibility and ease of con
trolling the time constant by inserting a selected
number of the short circuiting winding elements.
While I have shown and described a limited
number of modi?cations within the scope of my
same whether the element lies next to the sup
invention, it will be apparent from the foregoing
porting structure I, or close to the armature, or
to those skilled in the art that other embodiments
in some intermediate position.
10 may be devised without departing from the prin
The time delay curves shown in Fig. 4 are based
ciples and teaching of this disclosure. Therefore,
on test results obtained with a
I wish this speci?cation to be considered as illus
trative and not in a limiting sense.
I claim as my invention:
indicates the number of elements 22 inserted into
1. An electromagnetic time-limit device, c0m~
the coil while the ordinate values denote the time 15
prising a magnetic ?eld structure having a core,
delays in seconds. The results were obtained by
energizing the magnetizing core of the relay and
an armature pivotally linked to said structure and
then interrupting the energizing current.
being biased away from one end of said core to be
time elapsing
attracted thereby when
core is magnetized, a
20 magnetizing coil surrounding said core with will
cient spacing to form an interstice around and
cates the delays obtained with a relatively low
along said core for the reception of short-circuit
contact pressure, i. e. a corresponding adjustment
of the relay spring 10, while curve D refers to
the same relay with the spring l0 adjusted for
a higher contact pressure. In both cases, the 25
period of delay was de?nitely determined by the
number of winding elements 22. The two curves
indicate that any period of delay between the
2. An electromagnetic time-limit device, com
30 prising a magnetic frame structure, an elongated
core having one end attached to said structure
tially the same results are obtained with differ
ent shim arrangements. For instance, Fig. 5
shows a similar relay in which a shim of high
magnetic reluctance, denoted by 23, is attached
by the armature 6 and hence removable from
i
the stationary relay structure together with the
armature assembly.
According to the embodiment represented by
Fig. 6, a shim 25
inserted between
'
g 45
to be insertable and remov
able from the side of said free end when said as
sembly is removed from said structure, whereby
the time-limit of the device is adjustable by a
body of the magnet core 2 and is fastened by
riveting the end 2! of the core. Similar to the
corresponding selection of the inserted element.
3. An electromagnetic time-limit
50
prising a magnetic frame structure, an elongated
55
netizable supporting structure I. In this case,
the shim 29 remams permanently attached to the
relay is adjusted by
elements,
a plurality of short-circuiting cy
lindrical ring elements
the time limit of the device by a corresponding
selection of said elements, said elements having a
radial width nearly equal to that of said interstice.
RALPH B. IMIMEL.
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